hills



L. B. HILLS;

STORAGE BATTERY GRID. A APPUCATION mm Nov. :5. 1916.

1,303,478, a v Patnted May 13, 1912 A TTORNEY VINVENTIOR. r32 5. HILLE UNITED STATES PATENT OFFICE.

LEON 13. nuts, or LAKEWOOD, OHIO, ASSIGNOB, IBY MESNE Assremvrnnrs, 1'0 NATIONAL CARBON COMPANY, INC., A CORPORATION OF EW YORK.

STORAGE-BATTERY GRID.

Specification of Letters Patent.

Patented May 13, 1919.

To all whom it may concern:

Be it known that I, LEON B. thus, a citizen of the United States, and resident of Lakewood, in the-county of Cuyahoga and State of Ohio, have invented a certain new and useful Improvement in Storage- Battery Grids, (Docket No. 267,) of which the following is a full, clear, and exact description.

This invention relates to molds for storage battery gridsor electrodes and one Object is to design a mold of such structure that the parts can be readily machined to fit together without exercising more than ordinary care.

Another object is to produce a mold that will cast a grid of minimum weight for given strength which will be free from fins and have an increased tendency to retain the paste in place.

A further object is to provide a mold that will extend the side ribs closer to the center of the grid to increase the conductivity without adding to the weight and with increased transverse strength.

Referring to the drawings,

Figure 1 is a plan of the .upper the mold shown in Fig. 2.

Fig. 2 is a section of the separated halves of the mold taken on the line A-A. of Fig. 1 the lower half only being completely machined.

Fig. 3 is a section similar to Fig. 2 excepting that the mold is Completely machined and the halves are in operative position. I

Fig. 4 is a section taken on the line B-B of Fig. 1, the halves of the mold being shown in operative position.

Fig. 5 is a side view of a grid cast in my improved mold.

Fig. 6 is a section on the line G-C of Fig. 5.

Referring to Figs. 1 and 2, one-half of a mold 1 is rabbeted at 2 to form the frame of the grid. This rabbet or groove may be put in the mold in well known ways and inasmuch as it is not novel per se 1 have not illustrated the make-up of the mold to indicate how this can be done. When the half of groove 2, however, has been formed I machine a plurality of triangular grooves 3 transversely of the mold, forming ridges t. Then grooves 5 are machined in the bottom of the grooves 3 as shown in Fig. 3, and cross grooves 6 are cut to form the strengthening ribs of the grid.

The lower half of the mold is made similar to the upper half excepting that the The structure of the grid is clearly shown in Figs. 5 and 6. The novel feature of the grid resides in the shape of the bottom portion 8 of the ribs 9. Heretofore the. ribs have been made with a fiat base, and my improvement not only reduces the amount of lead required without decreasing the strength, but it also furnishes additional means for retaining the paste.

Also .the prongs 9 pro] ect toward the-"center of the plate and provide means for the current reaching a greater amount of the active material by a path of good conductivity.

To a mechanic it would be a simple mat ter to machine the grooves 3 and 5 on a planer and when the two halves are finished, they will fit perfectly and cause no fins to be formed on the grid.

Havingdescribed my invention what I claim is In electric batteries, a grid consisting of an outer frame, a plurality of spaced ribs of less depth than said frame extending thereacross at each side, said ribs having V- shaped grooves on the inside and being spaced away from the middle plane of the frame whereby a continuous middle chamher is formed for the active material, the ribs on one side being staggered in relation to those on the other.

In testimony whereof, I hereunto affix my signature.

L. B. HILLS. 

